Rotor retaining member



Jan. 13, 1970 H. A. DUQUETTE ROTOR RETAINING MEMBER Filed April 1, 1968FIG.3

FIG.4

FIG.2

INVENTOR. HENRY A. DUQUETTE United States Patent Office 3,438,937Patented Jan. 13, 1970 3,488,937 ROTOR RETAINING MEMBER Henry A.Duqnette, Greensboro, N.C., assignor to Textile Development & Sales,Inc., Greensboro, N.C., a corporation of North Carolina Filed Apr. 1,1968, Ser. No. 717,584 Int. Cl. D01h 7/92, 7/46 US. Cl. 5777.45 7 ClaimsABSTRACT OF THE DISCLOSURE BACKGROUND, BRIEF SUMMARY, AND OBJECTIVES OFTHE INVENTION The bulk of stretchable yarns are produced on false twistspindle machines operating at speeds in excess of 75,000 r.p.m. Asubstantial number of high speed false twist spindles employ at eachspindle position a false twist spindle driving means which may includerevolving disks and magnetic permeable pole members in juxtaposition tothe spindle driving means to retain the yarn rotor twist tube member indriving engagement. In those applications where two pairs of rotatingdisks are utilized to drive and engage the yarn rotor twist tube member,the magnetic yarn rotor supporting member is positioned adjacent to thethroat formed between the disks to urge the yarn rotor twist tube memberinto driving engagement with the disks. High speed false twist twistspindle apparatus of the type under consideration is illustrated in US.Patent Nos. 3,058,289; 3,142,953; among others. Other high speed spindleapparatus in which the yarn is false twisted continuously to impartstretchable characteristics is shown in US, Patents 3,180,074;3,232,037; 3,296,789; 3,308,614 and 3,355,871.

Presently the high speeds of rotation and the high speed of yarn travelresult in frequent displacement of the small yarn rotor twist tubemembers for numerous reasons. The cost of replacement of the small twisttube rotors is costly as well as resulting in loss of production on thespindle position.

Efforts have been made to guard against the loss of the small yarn rotortwist tube members unsuccessfully. It must be considered that each falsetwist machine has in excess of 100 spindle positions and many sizes ofspindles are employed in a single throwing plant.

Therefore, it is an objective of this invention to provide a relativelyinexpensive yarn rotor retaining member which will prevent displacementof the yarn rotor twist tube member during normal causes fordisplacement.

Another objective of this invention is to provide a rotor retainingmember that will interfere with the discharge of a yarn rotor twist tubemember from driving engagement with a rotating rotor member drivingmeans on a false twist machine.

Still another objective of this invention is to utilize a magneticallyattractable retaining member or gate that will encircle or bridge thegap between projecting magthe removal and replacement of a yarn rotortwist tube member on a false twist machine without necessitatingextensive downtime and a minimum of maintenance.

Another objective of this invention is to utilize a magneticallyattractable member that will span the gap between spaced apart magneticpole pieces positioned to retain a yarn rotor twist tube member throughthe magnetic attraction against a rotor member driving means to preventloss through displacement upon malfunction.

Other objects and many of the attendant advantages of this novel rotorretaining means for use in combination with a false twist spindledriving assembly will become more readily apparent from the followingdescription taken in conjunction with the accompanying drawing whereinlike characters of reference designate like parts throughout the severalviews.

DRAWING DESCRIPTION FIG. 1 is a front elevational view of a false twistspindle assembly position illustrating one embodiment of the inventionon a false twist spindle assembly in which spaced apart pairs of disksare employed in conjunction with magnetic pole pieces to retain a yarnrotor twist tube member in rotating position.

FIG. 2 is a transverse sectional view taken substantially along theplane of section line 2-2 of FIG. 1.

FIG. 3 is an enlarged perspective view of a pair of pole pieces mountedto a block with a yarn rotor tube member retaining means pivotallymounted thereon illustrating the rotor retaining member shown in FIGS. 1and 2.

FIG. 4 is a partial transverse sectional view of a modified embodimentof rotor retaining means.

FIG. 5 is a partial transverse sectional view of another modified formof rotor retaining member.

DETAILED DESCRIPTION Referring to FIGS. 1, 2 and 3 of the drawing, thereis illustrated a preferred embodiment of the invention in which thefalse twist spindle assembly 10 is mounted on the false twist machineframe 11 with the belt drive member 12 driven from a pulley (not shown)in a conventional manner and rotates the downwardly projecting whorl 13that is bearingly supported in the housing 14 with the upper end of thereduced whorl 15 having supported thereon spaced apart yarn rotor twisttube driving disks 16 that are vertically spaced from each other bymeans of the hub 17.

A complementary housing 18 to housing 14 is laterally spaced therefromfor bearingly supporting the shaft 19 on which there is mounted thevertically spaced apart rotor contacting disks 20 spaced vertically fromeach other by means of the central hub 21. Shafts 15 and 19 are spacedlaterally from each other to provide a rotor tube member receivingthroat 22 between the disks 16 and 20 for cooperative receiving indriving relationship the yarn rotor twist tube member 23 which isprovided with axial yarn passageway therethrough with the upper end ofthe rotor member being provided with a cap 25 through which the yarnwill pass continuously at the upper end of which is a cross pin 26 forsupporting a yarn convolution thereon. The rotor twist tube member 23 isalso provided with an enlarged cylindrical intermediate section 27 of asuitable magnetically attractable permeable material or other suitablemagnetically attractable material which will be responsive to themagnetic attraction of the spaced apart magnetic permeable pole pieces28 and 29 that are secured to the plate 30 positioned adjacent to thespindle driving assembly and releasably secured to the bracket 31through the Allen bolt 32 on the machine frame 11.

The pole pieces 28 and 29 extend forwardly in a converging manner injuxtaposition to the throat 22 provided between the spaced apart disks16 and 20 with the laterally spaced apart pole ends 33 and 34 beingspaced apart laterally to provide a suitable magnetic field to attractthe yarn rotor twist tube member 23, and particularly the cylindricalportion 27 to be positioned in driving engagement with the disks 16 and20 engaging the yarn roller twist tube member 23 as the cylindricalportion 27 is positioned between the pairs of disks 16 and 20 within thespace provided by the reduced hubs 17 and 21.

A yarn rotor twist tube retaining member 35 is pivotally mounted throughthe pivot pin 36 which extends through the pole end 34 and the extendingears 37 of the member 35. It is desirable, although not essential, tomake the member 35 of a magnetically attractable material, however, itmay also be made of a non-ferrous or magnetically attractable material,such as polyethylene, nylon, or other suitable plastic material. In theevent the member 35 is made from a non-magnetically attractablematerial, a magnetically attractable plug or pin 38 is embedded thereinso as to be attracted to the pole piece 34 in the closed positions ofthe rotor retaining member 35 as shown in FIGS. 2 and 3. The retainingmember 35 is shown in outline form in FIG. 2 in the open positionpermitting the placement or removal of the rotor member in the throat22. The free end 40 of the member 35 preferably projects beyond the polepiece 33 to facilitate pivoting of the member 35 into and out ofengagement with the pole piece 33.

An alternate embodiment of the rotor retaining member 41 is shown inFIG. 4 in which the pole pieces 33 and 34 are bridged by the bar 42 inwhich there is a rotor tube receiving recess 43 intermediate the lengththereof comparable to the rotor-receiving recess 39 in member 35. AU-shaped retainer spring 44 with downwardly extending legs 45 engage thesides of the pole pieces 33 and 34 for releasably retaining the rotorretaining means 41 in position. If desirable, the bar 42 may be made ofa magnetically attractable material for attraction to pole pieces 33 and34 or of a plastic material permitting the U-shaped clamping member 44to retain the rotor retaining member 41 in position.

A further alternate embodiment of a rotor retaining member 46 is shownin FIG. in which the pole pieces 33 and 34 are bridged by thetransversely extending bar 47 which may be of a magnetically attractablematerial in which there is a rotor member receiving recess 48 positionedintermediate the length thereof. The terminal ends 49 of the bar 47extend laterally beyond the lateral spacng of the pole pieces 33 and 34to facilitate engaging and disengaging the pole pieces. In the event thebar 47 is made of a non-magnetically attractable material, plugs )r pins50 of a magnetically attractable material may be embedded or passedthrough the bar 47 for attraction and retention by the pole pieces 33and 34.

Obviously many modifications and variations may be made of the rotorretaining means for achieving the end result within the spirit of thisinvention.

What I claim is:

1. A yarn rotor retaining member for use in combination with a falsetwist spindle driving assembly having a yarn rotor twist tube member, arotating rotor member driving means, magnetic means supported injuxtaposition to said rotor driving means for maintaining said rotormember in driving contact with said rotor member driving means, androtor retaining means directly supported upon said magnetic means forlimiting rotor member displacement from said driving means.

2. A yarn rotor retaining member as claimed in claim 1, said magneticmeans comprising a pair of spaced apart magnetic permeable pole pieces,and said rotor retaining means comprising a magnetically attractablemember reaching across said pole pieces.

3. A yarn rotor retaining member as claimed in claim 2, said rotorretaining member being pivota-lly and releasably connected to one ofsaid pole pieces.

4. A yarn rotor retaining member as claimed in claim 2, said rotatingrotor member driving means including spaced apart pairs of rotor membersupporting disks forming a rotor member-receiving throat therebetween,said magnetic rotor supporting means permeable pole pieces terminatingin juxtaposition to said throat, and said. rotor retaining meansmagnetically attractable member. being releasably retained by saidmagnetic means at least partially encircling said yarn rotor twist tubememher.

5. A yarn rotor retaining member as claimed in claim 1, said rotorretaining means being releasably secured to said magnetic means.

6. A yarn rotor retaining member as claimed in claim 1, said rotorretaining member being pivotal-1y connected to said magnetic means.

7. A yarn rotor retaining member as claimed in claim 1, said rotorretaining means being secured to said magnetic means.

References Cited UNITED STATES PATENTS 3,058,289 10/1962 Raschle 5777.33,142,953 8/ 1964 Gassner et al 57-77.45 3,232,037 2/1966 Crouzet57-77.45 3,304,706 2/ 1967 Mattingly 5777.45 3,308,614 3/1967 Stahlecker57-77.45 3,355,870 12/1967 Mattingly 57-77.45 3,355,871 12/1967Mattingly 5777.45

JOHN PETRAKES, Primary Examiner

